EP0501212A1 - Plant to select and bend bars for building work - Google Patents
Plant to select and bend bars for building work Download PDFInfo
- Publication number
- EP0501212A1 EP0501212A1 EP92102148A EP92102148A EP0501212A1 EP 0501212 A1 EP0501212 A1 EP 0501212A1 EP 92102148 A EP92102148 A EP 92102148A EP 92102148 A EP92102148 A EP 92102148A EP 0501212 A1 EP0501212 A1 EP 0501212A1
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- EP
- European Patent Office
- Prior art keywords
- bars
- plant
- bundle
- shears
- bend
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/006—Feeding elongated articles, such as tubes, bars, or profiles
Definitions
- the plant to select and bend bars for building work makes possible the storage and prior sorting of the bars to be bent and their automatic feed towards a shearing and bending platform on which the bundles of bars are sheared and bent as required.
- the fork means 20 comprise two idler rollers 22 having their axes substantially parallel and also parallel to the central axis 16 of the fork means 20.
- the second roller conveyor 27 cooperates with traversing conveyor means 28 equipped with projections 29, which convey the bars 14 onto a third roller conveyor 30 that butts the bars 14 against the abutment face 18.
- a second movable arm 31 may be included to cooperate with the line of passage 21 of the bars 14 and with the first movable arm 31; the second movable arm 31 will be positioned downstream of the bending unit 41 so as to position and move the leading end of the bars 14 in this zone.
- the first five bends (a, b, c, d and e) are made by feeding the bundle of bars 14 forwards; the bundle is then fed forwards by the required length and sheared; the other eight bends (f, g, h, i, l, m, n and o) are made by retracting the bundle of bars upstream.
Abstract
- the first traversing roller conveyor (17) comprising means to butt a bundle of bars (14) by means of an abutment face (18),
- fork means (20) for the positioning and vertical alignment of the bundle of bars (14) being included between the first traversing roller conveyor (17) and the shears (39),
- the movable engagement and positioning arm (31) including in its lower portion a movable engagement gripper (34) and cooperating with the abutment face (18), a relative vertical movement taking place between the movable engagement arm (31) and the shears (39) during the transient time of the arm (31) passing the shears (39).
Description
- This invention concerns a plant to select and bend bars for building work, as set forth in the main claim.
- The plant according to the invention is correctly used in the field of processing reinforcement bars for building work, whether the bars are supplied in straight lengths or in rolls.
- In particular, the plant to select and bend bars for building work makes possible the storage and prior sorting of the bars to be bent and their automatic feed towards a shearing and bending platform on which the bundles of bars are sheared and bent as required.
- Nowadays the selecting, shearing and bending operations are carried out in at least two separate and distinct plants, of which one plant performs the selecting and shearing, whereas the other plant is located elsewhere and carries out the bending and shaping.
- Documents FR-2.533.477, DE-2.718.744 and US-3,871,288 disclose a plant to shear to size bars fed from a store.
- Documents DE-2.352.469 and DE-2.456.086 disclose a movable carriage device to take bars from a bundle and to convey them beyond a shears that shears to size. The bars, when sheared to size, are conveyed to a bending-shaping plant by a suitable conveyor means such as a bridge crane, roller conveyor or tipper trucks or are deposited in suitable stores.
- It is obvious that a great deal of time is wasted in the handling operations and that considerable space and long cycle times are required, and therefore the systems of the state of the art are hardly economical.
- Moreover, the plants of the state of the art require many intermediate operations and are a source of accidents and danger for the machine operators.
- As against this, the present production requirements favour as little used space as possible, limited cycle times, automation of the cycle, reduction of the labour force, less consumption of materials, less requirements of maintenance, greater safety for the employees, etc.
- The present applicant has designed, tested and embodied this invention to avoid the shortcomings of the state of the art and to achieve further advantages.
- This invention is set forth and characterized in the main claim, while the dependent claims describe variants of the idea of the main embodiment.
- The purpose of this invention is to provide a plant suitable to carry out with a continuous, automatic cycle the selection, shearing, bending and shaping of bars for building work and to reduce the space taken up to that substantially needed for one single plant.
- Moreover, the invention makes possible lower consumption of materials, less random maintenance operations, greater safety for the machine operators, a smaller labour force, etc.
- Contrary to the existing bending, shaping plants, the invention enables the bars to be prepared while the other operations are in progress, thus achieving a great increase in output.
- Furthermore, the plant according to the invention obviates the use of means such as bridge cranes and tipper trucks to convey the bars from their storage and selection assemblies to the shearing and bending asembly, thus ensuring greater safety for the machine operators.
- The plant enables the cycle times to be reduced and only one machine operator to be required since the various operations are, in fact, all automated.
- The plant to select and bend the bars for building work comprises an assembly to store and select bars which includes a compartmented store in which the bars are positioned according to their cross section and their type of material, suitable feeder means, a roller conveyor to traverse and butt the bundle of selected bars and a bar positioner assembly to position the selected and butted bundle of bars.
- A variant provides for the bars to be fed directly from rolls of bars in cooperation with, or in replacement of, the compartmented store. In this case the feed system consists of a bench for the rolls of material, a straightening machine, a shears and a roller conveyor cooperating either directly with the traversing roller conveyor or preferably with a second independent roller conveyor connected by suitable means to the bar positioner assembly.
- Suitable independent feeder means are comprised between the traversing roller conveyor feeding the bundle of selected bars and the bar positioner assembly.
- According to a variant the bar positioner assembly is capable of an auxiliary movement which enables that assembly to carry out also the functions of a transfer means.
- A suitable movable arm is included in cooperation with the frontal portion of the bar positioner assembly and can slide along a runway positioned lengthwise along the shearing and bending platform and axially to the bundle of positioned bars; this movable arm is equipped with suitable engagement grippers to engage the bundle of positioned bars and has the task of displacing the bundle of bars axially and positioning it either in relation to the successive shearing assembly or in relation to the bending unit located on the shearing and bending platform.
- The movable arm, when it passes in cooperation with the shears, is raised along the distance necessary for such passing and then is lowered to continue its path.
- According to a variant the shears is lowered below the level of the shearing and bending platform for the time necessary for the movable arm to pass by.
- Retaining means to clamp the bundle of bars in position during the bending step are included together with the bending unit on the same axis as the bars and upstream and downstream of the bending unit itself.
- This bending unit enables bends to be accomplished in four directions depending on the initial positions taken up by the abutment roll and bending pin respectively of the bending unit in relation to the bundle of bars.
- To be more exact, when the retaining means upstream of the bending unit clamp the bundle of bars, clockwise or anticlockwise bends can be made on the leading end of the bars, depending on whether the bending disk of the bending unit rotates clockwise or anticlockwise.
- Instead, when the retaining means downstream of the bending unit clamp the bundle of bars, clockwise or anticlockwise bends can be made on the trailing end of the bars, depending on whether the bending disk of the bending unit rotates clockwise or anticlockwise.
- A second movable arm may be included which acts downstream of the bending unit so as to speed up the operations of positioning the bars.
- The bending unit cooperates with a large supporting bench since the embodiment of the invention enables bends of very large types to be made without the use of machine operators, thus achieving greater safety for the latter.
- The supporting bench comprises conveyor means with projections arranged in a lengthwise direction, these means making possible the work of removing the bundle of sheared or bent bars.
- Suitable auxiliary arms are included in cooperation with the bending unit and enable the same to make bends which may even lead to the superimposing of segments of the same bundle of bars on top of each other. These auxiliary arms have the task of lifting suitably the segment already bent, which otherwise would prevent the formation of successive bends to be made.
- According to a variant, when the first bend has been made, the bundle of bars is fed forwards by the whole required length and is then sheared; next, the other bends are made by withdrawing the bundle of bars upstream each time for each bend and making the required bend each time.
- According to yet another variant, when a plurality of bends have been made, the number of which may vary according to the shape of the finished stirrup to be made, the bundle of bars is fed forwards by the whole required length and is then sheared; next, the other remaining bends are applied by withdrawing the bundle of bars upstream each time for each bend and making the required bend each time.
- The cycles described in the last two variants enable the bending unit to make even bends which cause segments of the bars to be superimposed on each other without the use of any auxiliary arms since it is the movable arm itself which grips and raises the initial segment containing at least the first bend of the bundle of bent bars, thus enabling the last bend to be applied without the segments of the bar contacting each other.
- The attached figures, which are given as a non-restrictive example, show some preferred embodiments of the invention as follows:
- Fig.1
- is a plan view of a plant to select and bend reinforcement bars according to the invention;
- Fig.2
- shows a cross section of the storage, selection, butting and positioning assembly along the line A-A of Fig.1;
- Fig.3
- shows a cross section of the possible system of cooperation between the movable arm and the shears along the line B-B of Fig.1;
- Fig.4
- shows a cross section of the zone of cooperation of the retaining means with the bending unit along the line C-C of Fig.1;
- Fig.5
- shows a cross section of the bending unit along the line D-D of Fig.1;
- Fig.6
- shows a cross section of the conveyor means along the line E-E of Fig.1;
- Figs.7
- show the bar positioner unit acting also as a transfer means;
- Figs.8
- show the working of the retaining means cooperating with the bending unit;
- Figs.9
- show the fork means that position the bars together with their actuation means;
- Figs.10
- show a first bending cycle;
- Figs.11
- show a second bending cycle;
- Fig.12
- is a partly cutaway three-dimensional view of the terminal portion of the movable arm;
- Fig.13
- shows another method of transferring the bars from the first roller conveyor to the positioner forks;
- Figs.14
- show a third bending cycle;
- Fig.15
- shows a three-dimensional view of the application of the last bend of the bending cycle of Figs.14;
- Figs.16, 17 and 18
- show some shapes of stirrups which can be made with the method according to the invention.
- In the figures the
reference number 10 indicates generally a plant to select and bend reinforcement bars 14 according to the invention. - The
plant 10 comprises a first storage andselection assembly 11 consisting in this case of acompartmented store 13 having a progressively decreasing height, within which are positionedbars 14 according to their cross section and the materials of which they are made. -
Movable chutes 15 are comprised above the compartments and are kept lowered (as shown in Fig.2) when bars 14 stored in anupstream compartment 46 have been selected, whereas themovable chute 15 is lifted to enablebars 14 to be withdrawn from thecompartment 46 in which thebars 14 selected are stored. - A
machine operator 47 is located at the downstream end of thecompartmented store 13 and has raisedsteps 48 available to provide ready access to thecompartment 46 in question. - The
machine operator 47 selects thebars 14 required in thecompartment 46 containing them and makes them slide on a firsttraversing roller conveyor 17 in the number required to form a bundle of selectedbars 14 to be sheared and/or bent. - The
first roller conveyor 17 has the task of butting the bundle of selectedbars 14 against anabutment face 18 which acts as a butting means. - In the example shown the first
traversing roller conveyor 17 cooperates with suitable transfer means 19 consisting of blades, which are lifted when required by the cycle so as to transfer the bundle of buttedbars 14 into suitable positioner fork means 20. - In this example retractible stops 67 are included and free the passage from the
first roller conveyor 17 to the positioner fork means 20. - According to the variant shown in Fig.13, so as to obtain transfer of the bundle of
bars 14 into the positioner fork means 20, thefirst roller conveyor 17 has its rollers sloped towards the fork means 20, so that thebars 14 are butted and then slide into the positioner fork means 20. - According to the variant shown in Figs.7 the transfer of a bundle of selected and butted
bars 14 from thefirst roller conveyor 17, where the bundle is butted, to the positioner fork means 20 is achieved by rotating the positioner fork means 20 by about 90° (see Fig.7a) and then displacing the fork means 20 towards thefirst roller conveyor 17 until all thebars 14 are contained betweenidler rollers 22 which compose the positioner fork means 20 (see Fig.7b); the positioner fork means 20 containing the bundle ofbars 14 are then either rotated about theircentral axis 16 so as to create a gripping effect or are brought towards each other so as to grip the bundle ofbars 14 contained between them. - When the bundle of
bars 14 has been gripped by theidler rollers 22 of the fork means 20, the fork means 20 are returned to their vertical position (see Fig.7c). - In this example the fork means 20 comprise two
idler rollers 22 having their axes substantially parallel and also parallel to thecentral axis 16 of the fork means 20. - In their normal position the
idler rollers 22 have their axes positioned vertically. - The fork means 20, when in their vertical position again, rotate about their
axis 16, so that oneidler roller 22 presses on the righthand side and theother idler roller 22 on the lefthand side of the bundle ofbars 14, thus ensuring that thebars 14, whatever their diameter, in the bundle are positioned, one above another, exactly on thecentral axis 16. - Figs.9 show the positioner fork means 20 and, in particular, the relative actuation means if the fork means 20 have to act also as transfer means.
- In this example the actuation means of the fork means 20 consist of a
first actuator 49 which makes possible a horizontal traversing movement of the fork means 20 on aslider 53, asecond actuator 50 which causes rotation of the fork means 20 about apivot 51 solidly fixed to theslider 53, and athird actuator 52 which rotates the fork means 20 about theircentral axis 16. - According to a variant the traversing movement towards the
first roller conveyor 17 is caused by afirst actuator 49 solidly fixed to the fork means 20 themselves; in this way thepivot 51 takes on a stationary position, as can be seen also in the diagrams of Figs.7 - Suitable clutch means or torsion regulation means, which are not shown here, are included so that the fork means 20, by rotating about their
axis 16, will not deform thebars 14. - A feed of
bars 14 directly fromrolls 23 is provided in cooperation with, or instead of, thecompartmented store 13. In this case anauxiliary feeder assembly 24 will consist of a straighteningmachine 25, afirst shears 26 and asecond roller conveyor 27. - In this example the
second roller conveyor 27 cooperates with traversing conveyor means 28 equipped withprojections 29, which convey thebars 14 onto athird roller conveyor 30 that butts thebars 14 against theabutment face 18. - The first 17 and third 30 roller conveyors contain substantially the same parts and perform substantially the same functions and therefore bear the same reference numbers.
- When so required by the cycle as described above, the bundle of
bars 14 on thethird roller conveyor 30 is transferred into the positioner fork means 20. - According to a variant the
second roller conveyor 27 cooperates directly with the firsttraversing roller conveyor 17. - The ability to receive bundles of
bars 14 either from thecompartmented store 13 or from theauxiliary feeder assembly 24 ensures good working and output of theplant 10 performing selection and bending ofbars 14 and also a plentiful source of supply. - In this step of the process the butted bundle of
bars 14 lies lodged in the positioner fork means 20; the leading ends of thebars 14 are aligned and positioned immediately upstream of a shearing and bendingplatform 12 and are pre-arranged to cooperate with amovable arm 31. - The
movable arm 31 is borne on acarriage 32 and can run along arunway 33 arranged along the shearing and bendingplatform 12. - The
movable arm 31 is equipped withmovable engagement grippers 34 and has the task of engaging and drawing with itself the bundle ofbars 14 until thebars 14 cooperate with blades of a second shears 39 positioned upstream of the shearing and bendingplatform 12. - The
movable arm 31, when it passes in the vicinity of thesecond shears 39, has to be displaced upwards and to take the bundle ofbars 14 with it so as not to contact thesecond shears 39. - A variant provides for the
second shears 39 to be able to move vertically and to be retracted beneath the level of a supportingbench 40 when themovable arm 31 passes by (see Fig.3). - Fig.12 shows the terminal portion of the
movable arm 31 and makes clear, in particular, the kinematic mechanisms of the embodiment in question. - The upward vertical movement of the
movable arm 31 to avoid contacting thesecond shears 39, if thesecond shears 39 cannot move and themovable arm 31 has to pass thereover, is actuated by asixth actuator 55. - This
sixth actuator 55 makes possible the displacement of a wholemovable part 56 of themovable arm 31, whichmovable part 56 bearsmovable engagement grippers 34; thismovable part 56 bearing themovable engagement grippers 34 is constrained by astructure 57 of themovable arm 31 but is free to rise vertically within suitable guides 58. - Actuation of the
movable engagement grippers 34 to grasp or release the bundle ofbars 14 is caused by operating aseventh actuator 65, which in this case cooperates directly with atransmission 59 consisting of twoarms engagement gripper portions - The
transmission arms lever 61 arranged in such a way that it can transmit an equal lengthwise displacement in opposite directions to thetransmission arms - In this way, when the
seventh actuator 65 is operated, there is an equal approach (or distancing) of the two movableengagement gripper portions bars 14. - When the movable
engagement gripper portions 34a-34b grip the bundle ofbars 14, a suitableeighth actuator 64 causes the movement of apiston 66 which, owing to the inclusion ofmating seatings 62 machined in the inner sides of the movableengagement gripper portions 34a-34b, compresses the bundle ofbars 14 downwards against inwardly projectingledges 63 so as to ensure a firm engagement of themovable engagement gripper 34 and therefore a necessary stability of the bundle ofbars 14 being processed. - In this example cylinder/piston actuators have been included, but, in general, rack-and-pinion devices or any other known system suitable for the purpose could be comprised.
- When the
movable arm 31 has been positioned lengthwise and therefore has positioned the leading end of the bundle ofbars 14 in relation to the shearing line of thesecond shears 39, thebars 14 are sheared if the cycle so requires. - Suitable control and governing means take into account the position of the lateral projection of the
abutment face 18 in relation to the shearing line of thesecond shears 39 and govern the lengthwise movement of themovable arm 31. - A bending
unit 41 is located on the shearing and bendingplatform 12 on the axis of the line of thepassage 21 of the bundle ofbars 14. This bendingunit 41 is advantageously of the type disclosed in EP-A-379029 and comprises known means to invert bends. - Retaining means 35, which in this case are two clamping
grippers 36, one upstream and the other downstream, cooperate advantageously with the bendingunit 41 and are positioned on the axis of the line ofpassage 21 of the bundle ofbars 14, thisline 21 being at a tangent to a stop element of the bendingunit 41. - The clamping
grippers 36 cooperate with suitable lateral guides 38 and are actuated by suitable fifth actuators 37 (see Fig.8). When the cycle so requires, the clampinggrippers 36 are retracted beneath the level of the supporting bench 40 (see Fig.8a). - The clamping
gripper 36 located upstream of the bendingunit 41 has the task of clamping the bundle ofbars 14 when a bend has to be imparted to the bundle ofbars 14 downstream of the bendingunit 41 itself. - Instead, the clamping
gripper 36 located downstream of the bendingunit 41 has the task of clamping the bundle ofbars 14 for a bend to be applied upstream of the bendingunit 41. - According to a variant a second
movable arm 31 may be included to cooperate with the line ofpassage 21 of thebars 14 and with the firstmovable arm 31; the secondmovable arm 31 will be positioned downstream of the bendingunit 41 so as to position and move the leading end of thebars 14 in this zone. - Next, the
movable arm 31 positions the bundle ofbars 14, whether sheared to size or not by thesecond shears 39 according to the length to be processed, within the known bendingunit 41, while therelative clamping grippers 36 clamp the bundle ofbars 14. - Figs.10 and 11 show two applications of the invention. The bundle of
bars 14 is positioned by themovable engagement gripper 34 of themovable arm 31 at the right length on the shearing and bending platform 12 (see Figs.10a and 11a). - When the bundle of
bars 14 has been clamped by theclamping e grippers 36, themovable engagement gripper 34 of themovable arm 31 releases its grip and themovable arm 31 is re-positioned as required by the cycle. - The first bend, for instance a clockwise bend (see Figs.10b and 11b), is now applied at the leading end of the
bars 14. - The
movable engagement gripper 34 of themovable arm 31 re-engages the bundle ofbars 14, while the clampinggrippers 36 are opened within the supportingbench 40; the bendingunit 41 is re-positioned (see Figs.10c and 11c). - The
movable arm 31 is moved according to the second bent segment to be made and positions the bundle ofbars 14 in a manner analogous to that described above (see Figs.10d and 11d). - The second bend is now made, for instance a clockwise bend at the leading end of the bars 14 (see Figs.10e and 11e).
- In the example shown in Figs.11 the third bend is made in a manner analogous to the bends previously described, the clamping
grippers 36 taking action downstream of the bending unit 41 (see Figs.11f and 11g). - To make the fourth bend, the
movable arm 31 positions the bundle ofbars 14 in a suitable position (Fig.11h); then themovable engagement gripper 34 of themovable arm 31 releases its grip, while the clampinggrippers 36 downstream of the bendingunit 41 grip the bundle ofbars 14; the fourth bend, an anticlockwise bend at the trailing end of thebars 14, is now made (see Fig.11i). - To make the third clockwise bend at the leading end of the
bars 14 in the situation of Figs.10, the same steps are taken as in the case of the first and second bends ((see Figs.10f and 10g). - A different method is used to make the fourth bend. Suitable
auxiliary arms 42 arranged around the periphery of the bendingunit 41 are included which are pivoted on the supportingbench 40 alongaxes 43 substantially parallel to the supportingbench 40 and are actuated by suitablefourth actuators 54. Theseauxiliary arms 42 enable thebending unit 41 to make bends also which lead to superimposing of segments of the same bundle of bars on top of each other (Fig.10h). - In fact, when the
auxiliary arms 42 are raised suitably, it is possible to raise the segment of thebars 14 which otherwise would prevent formation of the bend to be made. - Fig.10i shows how the first bend would obstruct formation of the fourth bend, whereas by raising the appropriate
auxiliary arm 42 it is possible to obtain an extra lifting of the first segment of the bundle ofbars 14 so that this segment does not come into contact with the remainder of the bundle ofbars 14 during the bending step (see the section on the auxiliary arm of Fig.10i, as shown on the right of the figure). - Fig.10l shows the bundle of
bars 14 after a fourth anticlockwise bend has been made at the trailing end of thebars 14; the lateral view of Fig.10l (positioned at the right of the figure) shows the raising of the trailing end of thebars 14 by theauxiliary arm 42. - Thus, owing to the reciprocal action of the
second shears 39,movable arm 31, front andrear clamping grippers 36 and bendingunit 41 it is possible to obtain bundles ofbars 14 having the required length and bends. - Figs.14 show a third application of the invention. The bundle of
bars 14 is positioned at the right length on the shearing and bendingplatform 12 by themovable engagement gripper 34 of the movable arm 31 (see Fig.14a). - When the bundle of
bars 14 is clamped by the clampinggrippers 36 positioned upstream of the bendingunit 41, themovable engagement grippers 34 release their grasp and themovable arm 31 is re-positioned according to the requirements of the cycle. - The first bend is now made, for instance a clockwise bend in the leading end (see Fig.14b).
- The
movable engagement grippers 34 of themovable arm 31 re-engage the bundle ofbars 14 while the clampinggrippers 36 open within the supportingbench 40; the bendingunit 41 is re-positioned (see Fig.14c). - The
movable arm 31, while the bundle ofbars 14 is clamped in themovable engagement gripper 34, is displaced so as to feed the bundle ofbars 14 forwards by the required length; thesecond shears 39 is then actuated and shears the bars to size (see Fig.14d). - The bundle of
bars 14 now sheared to size is then positioned for application of the terminal bend (see Fig.14e). The terminal bend, for example anticlockwise at the trailing end, is then made (see Fig.14f). - The bundle of
bars 14 is then retracted upstream by the required length for each bend so that the third (see Figs.14g-14h) and fourth (see Figs.14i-14l) bends can be made, and these bends are applied in the same manner as the terminal bend in the trailing end, the clampinggrippers 36 located downstream of the bendingunit 41 coming into action. - For application of the fifth bend the
movable arm 31 positions the bundle ofbars 14 by retracting the bundle upstream by the required length (Fig.14m). - The
movable engagement gripper 34 of themovable arm 31, which keeps the first segment of the bundle ofbars 14 gripped, now raises thebundle 14 for application of the fifth bend (see Figs.14n-15). - In this way the bundle of
bars 14 can be bent, and bent bars are obtained which have their terminal segments superimposed on each other. - Figs.16 to 18 show some stirrups which are produced with the method, which provides for the forward feeding, shearing and upstream retraction of the bundle of
bars 14. - According to this method a first series of bends is made by causing the bundle of
bars 14 to advance for each bend; the bundle ofbars 14 is then fed forwards by the whole required length, and the shears is then actuated and shears thebars 14 to size. - The bundle of
bars 14 is then retracted upstream by the required length for each bend and the remaining bends are applied. - The number of bends made by feeding the bundle of
bars 14 forwards before thebars 14 are sheared to size will vary according to the shape of the stirrup to be produced. - In the example of Figs.16 and 17 the first four bends marked with "a", "b", "c" and "d" are applied by feeding the bundle of bars forwards for each bend and making the desired bend; the partly bent bundle of
bars 14 is then fed forwards by the required length and sheared; the remaining bends (e, f and g) respectively in the case of Fig.16 and (e, f, g, h and i) in the case of Fig.17 are made by retracting the bundle ofbars 14 upstream for each bend by the required length. - In the stirrup of Fig.18 the first five bends (a, b, c, d and e) are made by feeding the bundle of
bars 14 forwards; the bundle is then fed forwards by the required length and sheared; the other eight bends (f, g, h, i, l, m, n and o) are made by retracting the bundle of bars upstream. - It is clear that a variation in the shape of the stirrup will lead to a variation in the number of bends to be made during the forward feeding step and the upstream retraction step.
- The bending
unit 41 cooperates with a supportingbench 40 of a great size so as to enable bends even of very great forms to be made. - Downstream of the bending
unit 41 the supportingbench 40 comprises conveyor means 44, which in this case consist of a discharge conveyor belt positioned lengthwise and equipped with projections 45 (see Fig.6). - The
discharge conveyor belt 44 is operated only when it is necessary to take from the supporting bench 40 a bundle or bundles ofbars 14 already bent and ready for further operations.
Claims (19)
- Plant to select and bend bars for building work, which is suitable to select and bend simultaneously in a substantially identical manner a plurality of bars, starting with substantially identical bars, the plant comprising at least one store, a first traversing roller conveyor, a shears for shearing to size, at least one movable arm to engage and position bars lengthwise and a supporting bench, the plant being characterized in that:- the first traversing roller conveyor (17) comprises means to butt a bundle of bars (14) by means of an abutment face (18),- fork means (20) for the positioning and vertical alignment of the bundle of bars (14) are included between the first traversing roller conveyor (17) and the shears (39), and- the movable engagement and positioning arm (31) includes in its lower portion a movable engagement gripper (34) and cooperates with the abutment face (18), a relative vertical movement taking place between the movable engagement arm (31) and the shears (39) during the transient time of the arm (31) passing the shears (39).
- Plant as claimed in Claim 1, in which an auxiliary feeder assembly (24) containing feed materails in rolls (23) is included in cooperation with the fork means (20).
- Plant as claimed in Claim 1, in which the first traversing roller conveyor (17) comprises means (19) to transfer a selected bundle of bars (14) into the fork means (20).
- Plant as claimed in Claim 1, in which the first traversing roller conveyor (17) has a lateral development sloped towards the fork means (20), retractible stops (67) being included in an intermediate position.
- Plant as claimed in any claim hereinbefore, in which the fork means (20) can perform a substantially rotary movement about their vertical central axis (16).
- Plant as claimed in any claim hereinbefore, in which the fork means (20) can perform a lateral rotary movement associated with a linear movement cooperating with the first traversing roller conveyor (17) (Fig.7).
- Plant as claimed in any claim hereinbefore, in which the fork means (20) comprise idler rollers (22) having parallel axes positioned substantially symmetrically and parallel to the vertical axis (16) of the fork means (20).
- Plant as claimed in any claim hereinbefore, in which the movable arm (31) is raised at least in the transient time of passing the neighbourhood of the second shears (39).
- Plant as claimed in any of the Claims 1 to 7 inclusive, in which the second shears (39) is lowered substantially beneath the plane of a supporting bench (40) in the transient time of being passed by the movable arm (31).
- Plant as claimed in any claim hereinbefore, in which the supporting bench (40) comprises a bending unit (41).
- Plant as claimed in any claim hereinbefore, in which the bending unit (41) comprises retaining means (35) which clamp the bundle of bars (14) and are positioned vertically and have a clamping position and a retracted position, the retaining means (35) being located upstream and downstream of the bending unit (41).
- Plant as claimed in any claim hereinbefore, in which the bending unit (41) comprises means to invert the bending in four directions.
- Plant as claimed in any claim hereinbefore, in which the bending unit (41) comprises auxiliary arms (42) to raise the terminal bent portion of the bundle of bars (14).
- Plant as claimed in any claim hereinbefore, in which the supporting bench (40) comprises lateral conveyor means (44).
- Plant as claimed in any claim hereinbefore, in which the retaining means (35) comprise lateral guides (38) having a conical development and cooperating with clamping grippers (36).
- Plant as claimed in any claim hereinbefore, in which movable engagement gripper portions (34a-34b), able to move in a counterpart manner in relation to each other and having parallel engagement walls, cooperate at their upper end with a piston (66) applying vertical pressure.
- Plant as claimed in any claim hereinbefore, in which the movable engagement gripper portions (34a-34b) comprise at their lower end ledges (63) which extend towards the other movable engagement gripper portion (34b-34a).
- Plant as claimed in any claim hereinbefore, which comprises in sequence at least the following means: a store (13) for bars (14) and/or rolls (23) of bar material; abutment face means (18), positioner fork means (20) for vertical alignment, a shears (39), a movable arm (31) and a supporting bench (40) with a bending unit (41) to perform bends in four directions, the movable arm (31) cooperating with the abutment face means (18) as far as the zone downstream of the bending unit (41).
- Method for the simultaneous bending of a plurality of bars for building work, starting with substantially identical bars, the method being carried out with a machine comprising a shears (39), a bending unit (41), at least one clamping gripper (36) positioned in cooperation with the bending unit (41), and a movable slidable engagement gripper (34) able to be positioned along the lengthwise axis of the bars (14), the method being characterized in that the bundle of bars (14) is sheared to size and the first bend of their leading end is carried out (Fig.14b), thereafter the bundle being possibly displaced forwards for posssible further bends and thereafter being fed forwards by the whole required length and sheared (Fig.14d), after which with the movable engagement gripper (34) the bundle is retracted upstream by required lengths for the application of further bends (Figs.14e to 14m), whereby the movable engagement gripper (34) in performing the closing bend (Fig.14n) arranges to raise the initial segment containing at least the first bend in the leading end of the bars (14).
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUD910028 | 1991-02-28 | ||
ITUD910028A IT1248136B (en) | 1991-02-28 | 1991-02-28 | Equipment for selecting and bending iron bars for construction |
ITUD910214 | 1991-12-20 | ||
ITUD910214A IT1253000B (en) | 1991-12-20 | 1991-12-20 | System for selecting and bending bars for building work |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0501212A1 true EP0501212A1 (en) | 1992-09-02 |
EP0501212B1 EP0501212B1 (en) | 1995-05-31 |
Family
ID=26332483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92102148A Expired - Lifetime EP0501212B1 (en) | 1991-02-28 | 1992-02-10 | Plant to select and bend bars for building work |
Country Status (8)
Country | Link |
---|---|
US (1) | US5228322A (en) |
EP (1) | EP0501212B1 (en) |
JP (1) | JP3345436B2 (en) |
AT (1) | ATE123241T1 (en) |
CA (1) | CA2061221A1 (en) |
DE (1) | DE69202710T2 (en) |
DK (1) | DK0501212T3 (en) |
ES (1) | ES2072641T3 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1396296A1 (en) * | 2002-09-04 | 2004-03-10 | Schnell S.p.A. | Method for cropping to size and optionally bending profiled elements with bending and shaping machines, particularly profiled elements supplied in bar form |
AU778830B2 (en) * | 2000-05-31 | 2004-12-23 | Natsteel Asia Pte Ltd | Automated bar bender |
WO2005003482A1 (en) * | 2003-07-01 | 2005-01-13 | Onesteel Reinforcing Pty Ltd | A reinforcing component |
EP1738843A1 (en) * | 2005-06-27 | 2007-01-03 | M.E.P. Macchine Elettroniche Piegatrici S.p.A. | Feed device for metal bars and relative method |
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ES2103404T3 (en) * | 1992-09-15 | 1997-09-16 | Piegatrici Macch Elettr | DEVICE TO PERFORM CURVES AND METHOD RELATED TO THE SAME. |
US5355708A (en) * | 1993-12-20 | 1994-10-18 | Kauffman Kenneth A | Straight rod stock processor |
US5522245A (en) * | 1994-02-21 | 1996-06-04 | Calsonic Corporation | Device for producing metal rings |
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US5632175A (en) * | 1995-10-27 | 1997-05-27 | Green; Paul O. | Rebar fabricating apparatus |
IT1292692B1 (en) * | 1997-03-20 | 1999-02-11 | Schnell Spa | PROCEDURE AND MACHINE FOR AUTOMATIC BENDING OF PROFILES AND SIMILAR. |
US6128811A (en) * | 1998-07-15 | 2000-10-10 | Krueger International, Inc | Apparatus and method for forming table aprons |
US20080115558A1 (en) * | 2006-08-08 | 2008-05-22 | Danny Lee Frye | Powered rod cutting and bending system and method for fabricating same |
JP7128992B2 (en) * | 2017-11-20 | 2022-09-01 | 東陽建設工機株式会社 | Rebar bending equipment |
AR113669A1 (en) * | 2017-12-22 | 2020-05-27 | A C M S R L Automatismi Costruzioni Mecc | APPARATUS AND METHOD OF PREPARING BARS |
CN112958722A (en) * | 2021-02-03 | 2021-06-15 | 苏州芙路得智能科技有限公司 | Bending equipment for building stirrups |
CN112893690A (en) * | 2021-02-03 | 2021-06-04 | 苏州芙路得智能科技有限公司 | Bending method for building stirrup |
CN113338542B (en) * | 2021-06-15 | 2023-08-18 | 三一筑工科技股份有限公司 | Reinforcement cage and forming method thereof |
CN113664120A (en) * | 2021-09-01 | 2021-11-19 | 泰源工程集团股份有限公司 | Reinforcing steel bar hoop bending machine for reinforcing steel bar processing |
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DE1502837B1 (en) * | 1963-05-17 | 1970-08-20 | Kurt Laevemann | Feeding system of a cutting and bending system for steel rods for concrete structures or the like. |
NL7204195A (en) * | 1972-03-28 | 1973-10-02 | ||
FR2340152A1 (en) * | 1976-02-09 | 1977-09-02 | Best Baueisen Stahl Bearbeitun | Cutting method for steel reinforcing bars - has bars laid in racks on transfer trolley carrying material to shear blades |
GB2026361A (en) * | 1978-07-27 | 1980-02-06 | Schwarze Rigobert | Pipe bending equipment |
FR2451786A1 (en) * | 1979-03-23 | 1980-10-17 | Kajima Corp | PROCESS AND APPARATUS FOR THE CONTINUOUS PREPARATION OF REINFORCED CONCRETE REINFORCEMENTS |
EP0092462A1 (en) * | 1982-04-21 | 1983-10-26 | Profer | Production and transporting apparatus for processed pieces of wire |
EP0188850A2 (en) * | 1985-01-21 | 1986-07-30 | S.A.E. Srl Società Automatismi Elettronici | Device to feed bars |
US4681210A (en) * | 1984-08-23 | 1987-07-21 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for feeding bars through a bending or like processing station |
US4766754A (en) * | 1986-04-28 | 1988-08-30 | Watt Yang | Continuous process for bending long rods or tubes |
EP0379030A1 (en) * | 1989-01-18 | 1990-07-25 | M.E.P. Macchine Elettroniche Piegatrici S.p.A. | Movable shears upstream of a bending assembly and method to bend the trailing end of bars |
EP0379043A1 (en) * | 1989-01-18 | 1990-07-25 | M.E.P. Macchine Elettroniche Piegatrici S.p.A. | Drawing unit downstream of a bending assembly and method to bend the trailing end of bars |
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US610749A (en) * | 1898-09-13 | treat | ||
GB794648A (en) * | 1955-09-27 | 1958-05-07 | Stevens & Bullivant Ltd | Improved mechanism for feeding tubes or rods to swaging machines |
SU431933A1 (en) * | 1970-02-24 | 1974-06-15 | ||
SU424639A1 (en) * | 1971-07-13 | 1974-04-25 | новани клина предусмотрен расположенный выступ | A DEVICE FOR CAPTURING STEM BARS AND SUBMITTING THEM TO THE FEEDER'S STORE FIG. 1 shows the device, top view; 5 in FIG. 2 is a section along A — A in FIG. 1 (vertical wall conventionally not shown); pas figs. 3 — section 13 — B in FIG. 2; in fig. 4—7 — various webs of the gripping bodies in the process of cutting off and transferring a group of rods to the loading slot. On the base 1 with the ability to adjust the slope, the support beams of the bupker 2 are installed to stack bundles of rods loaded into the feeder 3 on them. stops 4. The wedge-shaped gripping bodies 5, which are vertically movable, are mounted with the help of rods 6 in guides 7 rigidly connected to the bed 1. Drives 8, for example, the peell cylinders of various claws, are also rigidly connected to the bed 1. Cluster-shaped e bodies 5 are at the base of horizontally rasyolozhennye protrusions 9 directed toward the loading slot 10, and provided with uporami.Zahvatnye pgarpirpo bodies 5 are joined at verschin connecting rods 11, which are capable of altering the length, for example telescopic. The distance between the organs of 30 can be changed, the last) and at 2025 |
US3871288A (en) * | 1973-11-23 | 1975-03-18 | Automation Development Corp | Automatic bar handling system |
DE2456086B2 (en) * | 1974-11-27 | 1976-09-16 | Peddinghaus, Carl Ulrich, Dr., 5600 Wuppertal | CONVEYOR DEVICE FOR CONCRETE STEEL BARS |
DE2718744A1 (en) * | 1977-04-27 | 1978-11-02 | Peddinghaus Carl Ullrich Dr | Shearing machine for cutting concrete reinforcing rods to length - runs on rails past ends of rod storage racks |
JPS5626616A (en) * | 1979-08-06 | 1981-03-14 | Kawasaki Steel Corp | Mounting apparatus for spool for winding coil |
IT1193054B (en) * | 1982-09-27 | 1988-06-02 | E Soc Automatismi Elettronici | METHOD AND METAL BAR CUTTING SYSTEM IN LESS LENGTH SECTIONS |
JPS623830A (en) * | 1985-06-28 | 1987-01-09 | Showa Alum Corp | Manufacture of meandered tube for heat exchanger |
DE3644482A1 (en) * | 1986-12-24 | 1988-07-07 | Ruhl Heinz | DEVICE FOR MACHINING ROD MATERIAL |
-
1992
- 1992-02-10 AT AT92102148T patent/ATE123241T1/en active
- 1992-02-10 ES ES92102148T patent/ES2072641T3/en not_active Expired - Lifetime
- 1992-02-10 DE DE69202710T patent/DE69202710T2/en not_active Expired - Lifetime
- 1992-02-10 DK DK92102148.1T patent/DK0501212T3/en active
- 1992-02-10 EP EP92102148A patent/EP0501212B1/en not_active Expired - Lifetime
- 1992-02-14 US US07/835,499 patent/US5228322A/en not_active Expired - Lifetime
- 1992-02-14 CA CA002061221A patent/CA2061221A1/en not_active Abandoned
- 1992-02-28 JP JP04373192A patent/JP3345436B2/en not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
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DE1502837B1 (en) * | 1963-05-17 | 1970-08-20 | Kurt Laevemann | Feeding system of a cutting and bending system for steel rods for concrete structures or the like. |
NL7204195A (en) * | 1972-03-28 | 1973-10-02 | ||
FR2340152A1 (en) * | 1976-02-09 | 1977-09-02 | Best Baueisen Stahl Bearbeitun | Cutting method for steel reinforcing bars - has bars laid in racks on transfer trolley carrying material to shear blades |
GB2026361A (en) * | 1978-07-27 | 1980-02-06 | Schwarze Rigobert | Pipe bending equipment |
FR2451786A1 (en) * | 1979-03-23 | 1980-10-17 | Kajima Corp | PROCESS AND APPARATUS FOR THE CONTINUOUS PREPARATION OF REINFORCED CONCRETE REINFORCEMENTS |
EP0092462A1 (en) * | 1982-04-21 | 1983-10-26 | Profer | Production and transporting apparatus for processed pieces of wire |
US4681210A (en) * | 1984-08-23 | 1987-07-21 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for feeding bars through a bending or like processing station |
EP0188850A2 (en) * | 1985-01-21 | 1986-07-30 | S.A.E. Srl Società Automatismi Elettronici | Device to feed bars |
US4766754A (en) * | 1986-04-28 | 1988-08-30 | Watt Yang | Continuous process for bending long rods or tubes |
EP0379030A1 (en) * | 1989-01-18 | 1990-07-25 | M.E.P. Macchine Elettroniche Piegatrici S.p.A. | Movable shears upstream of a bending assembly and method to bend the trailing end of bars |
EP0379043A1 (en) * | 1989-01-18 | 1990-07-25 | M.E.P. Macchine Elettroniche Piegatrici S.p.A. | Drawing unit downstream of a bending assembly and method to bend the trailing end of bars |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU778830B2 (en) * | 2000-05-31 | 2004-12-23 | Natsteel Asia Pte Ltd | Automated bar bender |
EP1396296A1 (en) * | 2002-09-04 | 2004-03-10 | Schnell S.p.A. | Method for cropping to size and optionally bending profiled elements with bending and shaping machines, particularly profiled elements supplied in bar form |
WO2005003482A1 (en) * | 2003-07-01 | 2005-01-13 | Onesteel Reinforcing Pty Ltd | A reinforcing component |
EP1738843A1 (en) * | 2005-06-27 | 2007-01-03 | M.E.P. Macchine Elettroniche Piegatrici S.p.A. | Feed device for metal bars and relative method |
Also Published As
Publication number | Publication date |
---|---|
CA2061221A1 (en) | 1992-08-29 |
EP0501212B1 (en) | 1995-05-31 |
DE69202710T2 (en) | 1995-11-09 |
DK0501212T3 (en) | 1995-07-31 |
JP3345436B2 (en) | 2002-11-18 |
ES2072641T3 (en) | 1995-07-16 |
JPH0569070A (en) | 1993-03-23 |
US5228322A (en) | 1993-07-20 |
ATE123241T1 (en) | 1995-06-15 |
DE69202710D1 (en) | 1995-07-06 |
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